diff --git a/deps/v8/include/v8-version.h b/deps/v8/include/v8-version.h
index 46fd905b3ce07b..09afd6248c377f 100644
--- a/deps/v8/include/v8-version.h
+++ b/deps/v8/include/v8-version.h
@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 7
 #define V8_MINOR_VERSION 8
 #define V8_BUILD_NUMBER 279
-#define V8_PATCH_LEVEL 12
+#define V8_PATCH_LEVEL 14
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)
diff --git a/deps/v8/src/heap/heap.cc b/deps/v8/src/heap/heap.cc
index 51f300b577fc50..ff3b34cfb4f29b 100644
--- a/deps/v8/src/heap/heap.cc
+++ b/deps/v8/src/heap/heap.cc
@@ -3397,10 +3397,6 @@ void Heap::NotifyObjectLayoutChange(HeapObject object, int size,
           ->RegisterObjectWithInvalidatedSlots<OLD_TO_OLD>(object, size);
     }
   }
-  if (MayContainRecordedSlots(object)) {
-    MemoryChunk::FromHeapObject(object)
-        ->RegisterObjectWithInvalidatedSlots<OLD_TO_NEW>(object, size);
-  }
 #ifdef VERIFY_HEAP
   if (FLAG_verify_heap) {
     DCHECK(pending_layout_change_object_.is_null());
diff --git a/deps/v8/src/heap/mark-compact.cc b/deps/v8/src/heap/mark-compact.cc
index e763d02e9f7c01..f7067a60ea225d 100644
--- a/deps/v8/src/heap/mark-compact.cc
+++ b/deps/v8/src/heap/mark-compact.cc
@@ -3419,18 +3419,7 @@ class RememberedSetUpdatingItem : public UpdatingItem {
           SlotSet::PREFREE_EMPTY_BUCKETS);
     }
 
-    if (chunk_->invalidated_slots<OLD_TO_NEW>() != nullptr) {
-#ifdef DEBUG
-      for (auto object_size : *chunk_->invalidated_slots<OLD_TO_NEW>()) {
-        HeapObject object = object_size.first;
-        int size = object_size.second;
-        DCHECK_LE(object.SizeFromMap(object.map()), size);
-      }
-#endif
-      // The invalidated slots are not needed after old-to-new slots were
-      // processed.
-      chunk_->ReleaseInvalidatedSlots<OLD_TO_NEW>();
-    }
+    DCHECK_NULL(chunk_->invalidated_slots<OLD_TO_NEW>());
 
     if ((updating_mode_ == RememberedSetUpdatingMode::ALL) &&
         (chunk_->slot_set<OLD_TO_OLD, AccessMode::NON_ATOMIC>() != nullptr)) {
diff --git a/deps/v8/src/heap/scavenger.cc b/deps/v8/src/heap/scavenger.cc
index e08717ac279de7..7d56882953e6f5 100644
--- a/deps/v8/src/heap/scavenger.cc
+++ b/deps/v8/src/heap/scavenger.cc
@@ -439,18 +439,7 @@ void Scavenger::ScavengePage(MemoryChunk* page) {
       },
       SlotSet::KEEP_EMPTY_BUCKETS);
 
-  if (page->invalidated_slots<OLD_TO_NEW>() != nullptr) {
-#ifdef DEBUG
-    for (auto object_size : *page->invalidated_slots<OLD_TO_NEW>()) {
-      HeapObject object = object_size.first;
-      int size = object_size.second;
-      DCHECK_LE(object.SizeFromMap(object.map()), size);
-    }
-#endif
-    // The invalidated slots are not needed after old-to-new slots were
-    // processed.
-    page->ReleaseInvalidatedSlots<OLD_TO_NEW>();
-  }
+  DCHECK_NULL(page->invalidated_slots<OLD_TO_NEW>());
 
   RememberedSet<OLD_TO_NEW>::IterateTyped(
       page, [=](SlotType type, Address addr) {
diff --git a/deps/v8/src/ic/ic.cc b/deps/v8/src/ic/ic.cc
index 3c8d1ea58280fb..54f4be7a221ee7 100644
--- a/deps/v8/src/ic/ic.cc
+++ b/deps/v8/src/ic/ic.cc
@@ -4,6 +4,7 @@
 
 #include "src/ic/ic.h"
 
+#include "include/v8config.h"
 #include "src/api/api-arguments-inl.h"
 #include "src/api/api.h"
 #include "src/ast/ast.h"
@@ -651,6 +652,10 @@ void IC::PatchCache(Handle<Name> name, const MaybeObjectHandle& handler) {
   }
 }
 
+#if defined(__clang__) && defined(V8_OS_WIN)
+// Force function alignment to work around CPU bug: https://crbug.com/968683
+__attribute__((__aligned__(32)))
+#endif
 void LoadIC::UpdateCaches(LookupIterator* lookup) {
   Handle<Object> code;
   if (lookup->state() == LookupIterator::ACCESS_CHECK) {
diff --git a/deps/v8/src/objects/lookup.cc b/deps/v8/src/objects/lookup.cc
index 445d0815f32659..4646b71a9ecdb1 100644
--- a/deps/v8/src/objects/lookup.cc
+++ b/deps/v8/src/objects/lookup.cc
@@ -4,6 +4,7 @@
 
 #include "src/objects/lookup.h"
 
+#include "include/v8config.h"
 #include "src/deoptimizer/deoptimizer.h"
 #include "src/execution/isolate-inl.h"
 #include "src/execution/protectors-inl.h"
@@ -978,7 +979,12 @@ Handle<Map> LookupIterator::GetFieldOwnerMap() const {
                 isolate_);
 }
 
-FieldIndex LookupIterator::GetFieldIndex() const {
+#if defined(__clang__) && defined(V8_OS_WIN)
+// Force function alignment to work around CPU bug: https://crbug.com/968683
+__attribute__((__aligned__(32)))
+#endif
+FieldIndex
+LookupIterator::GetFieldIndex() const {
   DCHECK(has_property_);
   DCHECK(holder_->HasFastProperties(isolate_));
   DCHECK_EQ(kField, property_details_.location());